Squared wave converter to Triangle wave - Electronic Circuits Projects Diagrams Free

prprog · 24th January 2007, 03:11 PM

I built a 74HC14 squared wave oscillator that I controlled using a capacitor and 12 pots (variable resistors) in series. By ear I tuned each one to a note in the scale. Now I want to change the squared wave to a triangle wave. How do I do this? Can you proposed a circuit?

Thanks

dch222 · 24th January 2007, 04:48 PM

Not so easy. The usual way of getting a triangle (sawtooth) wave is to charge a capacitor with a constant current and then discharge it quickly.

However, the charge rate is constant and therefore the amplitude reached will depend on for how long the charge is going on.

Since the period of your square wave depends on which note (frequency) you select, the amplitude of the triangle will get less as the frequency rises.

There will be ways around this, but it gets complicated.

Why do you want a triangle wave? It won't sound much different to a square wave.

wishbhonez · 24th January 2007, 05:30 PM

i suggest you use an integrator built from op amps.. just use the frequency to compute for the capacitors and resistors..

prprog · 26th January 2007, 05:09 PM

dch222

Can you post a circuit ?

This is for Wind Synthesizer. So far I manage to generate 3 octave by using a 4040 IC to divide the original square wave. It will be nice to have different type of wave , to get other sounds.

thanks,
PRPROG

Dr.EM · 26th January 2007, 07:10 PM

Can't remember where I found it but it should be just the job

Roff · 26th January 2007, 09:28 PM

Quote:

Originally Posted by Dr.EM

Can't remember where I found it but it should be just the job

I made a circuit similar to that many years ago. It's a feedback loop that maintains constant triangle amplitude as the frequency varies. The only problem I had was, as anticipated, there was a finite response time. When the input frequency changes abruptly, the triangle amplitude takes some time to settle.

Hero999 · 27th January 2007, 03:15 PM

Wow! Can the same technique be used to produce sinewaves?

eng1 · 27th January 2007, 03:44 PM

Once you have generated the triangular wave, you can buffer and shape it.
I want to study this circuit

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24th January 2007, 03:11 PM	(permalink)
prprog	Squared wave converter to Triangle wave I built a 74HC14 squared wave oscillator that I controlled using a capacitor and 12 pots (variable resistors) in series. By ear I tuned each one to a note in the scale. Now I want to change the squared wave to a triangle wave. How do I do this? Can you proposed a circuit? Thanks

24th January 2007, 04:48 PM	(permalink)
dch222	Not so easy. The usual way of getting a triangle (sawtooth) wave is to charge a capacitor with a constant current and then discharge it quickly. However, the charge rate is constant and therefore the amplitude reached will depend on for how long the charge is going on. Since the period of your square wave depends on which note (frequency) you select, the amplitude of the triangle will get less as the frequency rises. There will be ways around this, but it gets complicated. Why do you want a triangle wave? It won't sound much different to a square wave.

24th January 2007, 05:30 PM	(permalink)
wishbhonez	i suggest you use an integrator built from op amps.. just use the frequency to compute for the capacitors and resistors..

26th January 2007, 05:09 PM	(permalink)
prprog	dch222 Can you post a circuit ? This is for Wind Synthesizer. So far I manage to generate 3 octave by using a 4040 IC to divide the original square wave. It will be nice to have different type of wave , to get other sounds. thanks, PRPROG Last edited by prprog; 26th January 2007 at 05:13 PM.

27th January 2007, 03:15 PM	(permalink)
Hero999	Wow! Can the same technique be used to produce sinewaves? __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez And http://www.silicontronics.com, same screen name as here.

27th January 2007, 03:44 PM	(permalink)
eng1	Once you have generated the triangular wave, you can buffer and shape it. I want to study this circuit